Tire-mold



H. M. LAMBERT.

TIRE MOLD. APPLICATION FILED FEB. I9. i9l9- RENEWED FEB. 4, 192a.

Patented Aug, 2, 1921.

2 SHEETS-SHEET l.

PATENT OFFICE.

my in: LAMBERT, or roam, OREGON.-

TEE-HOLD.

Specification of Letters Patent.

Patented Aug. 2, 1921.

Application filed February 19, 1819, Serial No. 278,018. RenewedFebruary 4, 1921. Serial No. 442,590.

To all whom it may concern:

Be it known that I HENRY M. 'LAMI'BERT, a citizen of the United States,residing-at Portland, in the county of Multnomah and State of Ore on,have invented certain new and useful mpovements in Tire-Molds, of whichthe following is a specification.

My invention relates'to certain new and useful improvements in molds foruse in manufacturing cushion tires of the type disclosed in myapplication for patent Serial No. 200478, filed November 6, 1917.

In manufacturing tires of this character the tire is built up on the rimbetween side mold Iates, preferably according to the method disclosed inmy copending application filed on the 19th day of February, 1919, SerialNo. 278,917 and after the tire is built up a final compression force isapplied to constrict the mass within the mold so as to place the matterunder heavy pressure durmg the vulcanizing act.

be present invention has for its object to provide mold forms for use inconnection with the manufacture of tires, such as above described, of asimple, inexpensive construction that can be quickly and effectivelyemployed and from which the tire can be quickly and easily removed aftervulcanization.

In the drawings, I have illustrated two preferred forms of theinvention, and by reference to which it will be seen that:

Figure 1 is a cross section through the mold showing a tire in placewith the parts in the position they assume after the application ofcompactlng pressure to the mold plates.

Fig. 2 is a side elevation of the same.

Fig. 3 is a view similar to Fig. 1 illustrating a modified form of theapparatus.

ig. 4 is a detail side elevation of the structure shown in Fig. 3.

Fig. 5 is a sectional perspective view showing the tire built up betweenthe mold plates 7 before the peripheral orannular plates have beenplaced and before the tire has been vulcanized.

Referring now to the accompanying drawings in which like numerals ofreference indicate like parts in all of the figures, 1 represents thetwo side plates or forms between which the tire is built up. 2designates a base ring preferably formed in sections and shaped at 3 toreceive the rim on which the tire is built up. The tire ma be built upin the mold on the ring 2 wit out the rim 3, if desired. The side plates1 have portions 1 overlapping the base ring 2.

The plates 1 are provided with one or more annular series of holes 4 and5, those of one series being staggered with relation to those of theother series and corresponding holes of opposite side plates are alinedwith one another and recelve the core pipes 13. The opposing faces 6 ofthe mold plates are shaped to give the desired configuration to the sid:s of the tires.

In the form shown in Figs. 1 and 2, the peripheral edges 8 of the plates1 are flat to receive the ring-like peripheral mold ele ment 9, thelatter being made in sections which are provided, when non-skid treadsare desired, with projections 10 that are adapted to be pressed into thetread rubber and give the desired form to the tread of the tire. i

' The sections of the peripheral mold element 9 have their externalfaces 11 beveled, as shown in Fig. 1, to coiiperate with thecorrespondingly faced ring 12 which, when driven on from left to r ht inFig. 1, will cause the members 9 to be irought with their meeting edges22 in contact-and to contact the peripheral edges 8 of the side platesl-1, thereby closin the mold.

The outer faceso the side plates 1--1 of the mold are flat, as at 7, fora purpose pres-- ently to appear.

14 indicates tie bolts which ass through certaln'of the pipes 13 and wich may oe' used to hold the side plates 1 to ther during the buildingup of the tire, or any other suita)ble means may be employed for thepurpose In usin the invention, the rim is placed in the mo d afterhaving had the base part of the tire, consisting of the lower band andthe filler, formed ,on the rim. The rim is placed in the mold and thelower series of core pipes 13 are positioned in the holes 14 and thetire built up until the level of the upper series of holes is reached.After which, the next series of pipes 13 is located in the holes 5 andthe remainder of the tire built up, as described in my methodapplicadrawn all the way together to their final posi-- tion but (seedotted lines Fig. 3) the tire is built in while the mold plates l areseparated slightly. As soon as the'tire,has been built up between theplates 1 the peripheral sections 9 of the mold are placed around thesame and the ring 12 driven together to bring the meeting edges 22 ofthe sections 2) together and bring the sections 9 into engagc ment withthe peripheries of the plates 1, after which, pressure is applied tobring the plates 1 toward each other to their final posi tion shown inFig. 1, thereby bringing the material Within the mold under considerablepressure tending to compa'ct the same. The mold is then placed in avulcanizing kettle and the tire vulcanized while under pressure.

The drawing together of the plates 1-1 to their final position forapplying the required lateral pressure to the mass may be accomplishedby the use of the bolts 14, (or any other suitable clamping means) butwhere a vulcanizing kettle having a compressing plunger is employed, thebolts 1% (or clamps) are removed before the molds are put into thekettle,and the molds are laid, one on top of the other, with the Hatfaccs 7 lying in engagement one with the other. The plunger of thevulcanizing kettle is then operated to compress the stack of moldsthereby applying the required compression force to the plates 1 tocompact the mass of the tire in the direction of the axis of the same.It will be noticed that the width of the member 9 is the same as thefinal width of the mold between the side plates 1 after the side plates1 have been moved inwardly to their maximum position and the length ofthe pipes 13 preferably corresponds to the over-all width of the mold.The member 5) is centered with relation to the side plates 1 by springs1). Should the ring 9 not have been placed exactly central by theattendant it will be centralized by the springs 9* and forced to itscentral position during the compression of the parts in the vnlcanizingkettle, as will be clear to those skilled in the art, and the lengths ofthe pipes 13 as well as the width of the member 9 will serve to limitthe movement of the plates 1 toward each other during the compressionact.

If desired the tire may be built up directly in the mold without using arim and in that event the side plates 1 will be made integral with thebase ring 2, (the separation at 2", Fig. 1, being omitted) and a lightband will be laid over the space 2* between the partly separatedsections of the ring 2. Pinch bar holes Sl and over-flow holes 9", ifdesired, are also provided as shown in dotted lines in Fig. 1.

In Figs. 3, 4 and 5, I have shown a modilication of the invention inwhich. the side plates each have their peripheral surfaces stopped, asat 17, to correspond with the similarly stepped portion 18 of theannular members 15. The memberp 15 in this form not only serve to formthe annular or peripheral faces of the tread but cooperate with theforming faces 6 of the side plates to form the sides of the treadportion of the tire, the members 15 having their projections providedwith surfaces 16 cooperate with the surfaces (5. as shown in Fig. 3. Inthis form also two annular or. ring-like bodies 15 are employedseparated on their midplane by diverging surfaces which meet at 20 in anedge lying in the midplane of the mold when the parts are assembled. Themembers 15 are drawn together by bolts 21 which pass through flanges 19and when a non-skid tread is to be made. the ribs 10 are provided on themembers 15 and in that event the members 15 will be made in sectionswith their ends 22 adapted to be brought into engagement by bolts 24:passing through lugs 23 but when a smooth surface tread is to be made,the members 15 can be made in continnous rings. if desired.

l n using this form of the invention, the

tire is built up as shown in Fig. 5 and then the rings 1:) are, placedand bolted together. In drawing the rings 15 together by the bolts 21,any excess rubber will be pressed out and sheared off by the engagingedges 20, as shown in Fig. 3 during the final drawing together of theparts. The dotted lines in Fig, :5, indicate the position of the partsduring the building up of the tire before the final compression hastaken place.

If it is desired to utilize the plunger of the ruk-anizing kcttle forapplying the compression force to the plates 1, the bolts 1% may heremoved and as the outer faces 7 of the plates 1 are in parallel planes,the molds can be stacked up in the kettle and compressed by the plungerof the same. The bolts '21 lying within the limits of the planes of thefaces 7-7 will not interfere with the use of the plunger 7 in thevulcanizing kettle.

After the tire has been vulcanized, the outer mold section 9 (form shownin Fig. 1) or the outer mold section 15-15 (form shown in Fi 3) isremoved, the core pipes 13 are punched out through the use'of a suitablepunch press, or in any other desired way, and the side plates are priedoff from the tire, after which, the tire will be ready for use and themold can be reassembled, before making up another tire.

Numerous modifications in the details of the construction of the moldcan be made, depending upon the particular conditions met with inpractice.

From the foregoing description, taken in connection with theaccompanying drawings, it is thought the complete construction,

Operation and advantages of my invention will be readily understood bythose skilled in the art.

What I claim is:

1. In a the mold, the combination with the base and side plates of themold, a sectional annulus for covering the gap between the side plates,said annulus having a ta pered exterior surface, and a tapered band orring adapted to he forced into engagement with said tapered surface tosecure the annulus sections together and hold the same in position withrespect to the side plates, said side plates having core pipe holes andcore pipes passed through said holes from one plate to the other.

2. In a tire mold, the combination With the base and side plates of themold, a sectional annulus for covering the gap between the side platesand means distinct from the side plates of the molds for holding theannulus sections together, said side plates havmg core pipe holes andcore pipes passed through said holes from one plate to the other.

3. In a tire mold, a pair of conforming side mold plates, base parts toconform to the tire rim, a sectional annulus to fit over the peripheriesof said plates and lnidge the gap between the same, a clamp ring oversaid annulus to hold its parts together, said side plates having corepipe holes, core pipes passed through said holes from one plate to theother, and means for holding said plates in position.

4. In a tire mold, a pair of conforming ,side mold plates, base parts toconform. to the tire rim, a sectional annulus to fit over theperipheries of said plates and bridge the gap between the same, a. clampring over said annulus to hold its parts together, said side plateshaving core holes, core pipes passed through said holes from one plateto the other, means for holding said plates in position, said pipesbeing of a length equal to the external Width of the mold when the saidplates have been drawn together to their final position.

5, In a tire mold, a pair of side mold plates, base portions to conformto the tire rim, core pipes removably held by and between said plates, aperipheral mold annulus, and means to hold said annulus over theperipheries of said side plates.

6. In a tire mold, a. pair of side mold plates, base portions to conformto the tire rim, core pipes removably held by and llG- tween saidplates, a peripheral mold annu- Ins, and means for applying contractingforce to said side plates and annulus to compact the mass within themold.

7. In a tire mold, a. pair of side mold plates, base portions to conformto the tire rim, core pipes removably held by and between said plates, aperipheral mold annulus, means for applying contracting force to saidside plates and annulus to compact the mass Within the mold. said meansin cluding bolts passed through said core pipes.

8. In a tire mold, a pair of side mold plates, base portions to conformto the tire rim. core pipes rcmovahly held by and between said plates, aperipheral mold anni|- his, means for applying contracting force in saidside plates am annulus to compact the mass Within the mold, said meansincluding bolts passed through said core pipes, said means includingclamping devices for mom ing the mold parts toward one another.

9. In a tire mold, an outer mold form, and transversely disposed corepipes held with in the form.

10. In a tire mold, an outer mold form, transversely disposed core pipesheld within the mold and provisions for effecting communication betweenthe interior of the pipes and the exterior of the mold.

HENRY M. LAMBERT.

